Hutchisons Battery ripped off by DOD?
www.hutchisoneffect.com...
TITLE: Battery Optimized for Long Term Storage and Intermittent Use
REFERENCE INFORMATION:
- Ref #1: Available from CISTI, ISSN: 0378 7753 document delivery
available to DTIC SBIR Registrants at cost. Approximate cost: $30.
To order call (800) DOD-SBIR, or use www.dtic.mil/dtic/sbir/service_req.html
- Ref #2: Available from CISTI, ISSN: 0885 8985 document delivery
available to DTIC SBIR Registrants at cost. Approximate cost: $20.
To order call (800) DOD-SBIR, or use www.dtic.mil/dtic/sbir/service_req.html
- Ref #3: Available in libraries. Out of print, a few copies
available from Amazon.com.
- Ref #4: Available from CISTI, ISSN: 0378 7753 document delivery
available to DTIC SBIR Registrants at cost. Approximate cost: $30.
To order call (800) DOD-SBIR, or use www.dtic.mil/dtic/sbir/service_req.html
- Ref #5: Available from CISTI, ISSN: 0013 4902 document delivery
available to DTIC SBIR Registrants at cost. Approximate cost: $12.40.
To order call (800) DOD-SBIR, or use www.dtic.mil/dtic/sbir/service_req.html
ADDITIONAL INFORMATION:
Here are some requirements for the RRAPDS Battery:
- Voltage: 3.3V for right now. This could go down as low as 2V.
- Amperage: The max current draw right now is 50 mA if we are
transmitting at max power. If we turn off the power amp, this drops
to 12 mA. Receive mode is a bit of a hog, itself, weighing in at 31
mA. These really swamp the current draw of everything else.
- Duty cycle: At one time, we calculated that 98.5% of the time, the
system would be in a power-down mode (sensors and RF off, processor
in LPM3 drawing only about 1.9 uA). When the processor comes up and
is in active mode (the other 1.5% of the time), it will pull about
560 uA by itself. Now, you have to add to this the 31mA draw of the
receiver for, say, 1 msec out of every 2 seconds (or 8 seconds; this
is an evolving topic). If it detects a hail message, then the
transmitter will be running for however long it takes to transfer
data. As to the sensors, their draw is in the tens of milliamps;
but their on time is in the order of microseconds.
- Dimensions: Small, very small. Look at the drawings from the PDR.
This should give you an idea of a footprint.
Q: Is the battery rechargeable or not?
A: I know this sounds like our former president, but it all depends
on what you mean by "rechargeable." If you mean hooking a power cord
up to it and recharging the battery that way, the answer is "no."
Given where these things will potentially be stored, that would be
impractical, if not impossible. If, on the other hand, you mean that
the
battery is capable of scavenging energy from its environment, then
I guess the answer might be "yes." However, if any of the offerors take
this definition, then they need to provide the mechanism for doing this
scavenging in environments where there is no light, movement, or temperature
differentials.
So, having said all of that, the short answer is "no."
Q: Can you give some idea on the size and the capacity of the battery?
A: The size is "small." Ideally, we would like something that is the
size of, say, a half dollar and about a quarter inch thick. But part
of the SBIR would be optimizing this size. As to capacity, roughly 98%
of the time, the device to which this battery would be attached will pull
less than 10 uA. However, there are other times (perhaps several minutes
in duration) where it would pull on the order of 200 mA. The targetted
battery life is 10 years. Calculating amp-hours is left to the student
as an exersize.
I have attached a spreadsheet giving the calculations behind my new
numbers. Summary: The majority of the time is spent in Sleep Mode,
where the current draw is 8.8 uA. The peak draw occurs during Data
Transfer with approximately 51 mA. "The battery should have an overall
capacity of approximately 2 amp-hours. It can expect to see an average
draw of 15 micro-amps with a peak draw on the order of 100 milli-amps."
Q: Could you be a bit more specific on the preferred battery type?
(From the references, we concluded that you are looking for a Li-ion
solid state rechargeable battery. Is it true?)
A: No to both questions. The subject of battery chemistry is wide
open. Whatever it takes to meet the requirements stated in the answer
to the question above (and doing it safely) is what we want.
Q: What are the temp ranges?
A: -55 to +68 C, 0 to 100% relative humidity, and shock hasn't been
specified yet.
[edit on 28-12-2004 by slave]